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The Map was developed
using five factors to determine radon potential: indoor radon measurements;
geology; aerial radioactivity; soil permeability; and, foundation type. Radon
potential assessment is based on geologic provinces. Radon Index Matrix is the
quantitative assessment of radon potential. Confidence Index Matrix shows the
quantity and quality of the data used to assess radon potential. Geologic
Provinces were adapted to county boundaries for the Map of Radon Zones.
Sections 307 and 309 of the Indoor Radon
Abatement Act of 1988 (IRAA) directed EPA to list and identify areas of the U.S.
with the potential for elevated indoor radon levels. EPA's Map of Radon Zones
assigns each of the 3,141 counties in the U.S. to one of three zones based on
radon potential:
- Zone 1 counties have a predicted average
indoor radon screening level greater than 4 pCi/L (pico curies per liter)
(red zones)
- Zone 2 counties have a predicted average
indoor radon screening level between 2 and 4 pCi/L (orange zones)
- Zone 3 counties have a predicted average
indoor radon screening level less than 2 pCi/L (yellow zones)
An Adobe Acrobat pdf version of the map is
available (suitable for printing):
color - zonemapcolor.pdf
(327KB file) | black & white - b&wmap.pdf (98KB file)
You can view your State's radon potential map by clicking on your State below.
Alabama || Alaska
|| Arizona || Arkansas
|| California ||
Colorado
|| Connecticut ||
Delaware
|| Florida || Georgia
|| Hawaii || Idaho
|| Illinois ||
Indiana
|| Iowa || Kansas
|| Kentucky ||
Louisiana
|| Maine || Maryland
|| Massachusetts ||
Michigan
|| Minnesota ||
Mississippi
|| Missouri ||
Montana
|| Nebraska || Nevada
|| New Hampshire ||
New
Jersey || New Mexico ||
New
York || North Carolina ||
North
Dakota || Ohio ||
Oklahoma
|| Oregon ||
Pennsylvania
|| Rhode Island ||
South
Carolina || South Dakota ||
Tennessee
|| Texas || Utah
|| Vermont || Virginia
|| Washington ||
West
Virginia || Wisconsin ||
Wyoming
The purpose of this map is to assist National,
State, and local organizations to target their resources and to implement
radon-resistant building codes. This map is not intended to be used to determine
if a home in a given zone should be tested for radon. Homes with elevated levels
of radon have been found in all three zones. All homes should be tested
regardless of geographic location.
IMPORTANT: Consult the EPA Map of Radon
Zones document (EPA-402-R-93-071) before using this map [call your
State
Radon Contact for a copy of the Map and the Zones document]. This document
contains information on radon potential variations within counties. EPA also
recommends that this map be supplemented with any available local data in order
to further understand and predict the radon potential of a specific area. If you
have questions about radon in water, you should contact your
State
Radon Coordinator.
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